By equilibrant theory study has been carried out for the causation to improve the oriented capability of the new type bogie to passing through the curve line 摘要利用力（矩）的平衡原理，分析了新型转向架曲线导向性能提高的机理。
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Based on the relative independence of mathematical cover and physical grid , and considering the action of truely existent various equilibrant force in system for system balance , a method of simulation for excavation unloading using numerical manifold method in geotechnical engineering is proposed 摘要基于数值流形方法数学覆盖与物理网格的相对独立性，考虑任一时刻体系中真实存在的各平衡力项对体系平衡的作用，提出用数值流形方法模拟岩土工程开挖卸荷的方法。
